Knot-forming mechanism



E. ADRIAN 2,000,504 KNOT FORMING rmcrumrsu May 7, 1935.

4 Sheets-Sheet 1 Filed Feb. 27, 1933 M y 1935- 4 EQ; ADRIAN 2,000,504

' KNOT romaine MECHANISM I Filed Feb 27, 1933 4 Sheets-Sheet 2 v Fall 1:317

May 7, 1935. E. ADRIAN 2,000,504

KNOT FORMING MECHANISM Filed Feb. 27, 1935 4 Shets-Sheet :5

Ma 7,1935. E. 103m 2,000,504

KNOT FORMING MECH ANISM Filed Feb. 2'7, 1933 tSQeecs-Sheet 4 Patented May 7, 1935 "PATENT OFFICE KNOT-FORMING MECHANISM Emile Adrian, St. Michel-sur-Menrthe, France Application February 27, 1933, Serial No. 658,870

In France and Germany March 10, 1932 This invention has for its object a mechanism allowing to form a knot of the so-called sheetbend type. This mechanism can be used in all cases where it is desirable to unite the ends of two flexible bonds. This mechanism is particularly adapted to provide an apparatus which can be held in one hand by the operator of a weaving loom, for instance, and it allows to rapidly form a perfect sheet-bend with the finest threads the tying together by hand of which is difiicult and rarely rapid, even for skilful fingers.

This mechanism is characterized by the combination, with rotary pincers, of a thread-stretching hook and of scissors, kinematically connected to one and the same operating member, in such a manner that the ends of the threads to be united being laid along either side of the rotary pincers, are first crossed for beginning the formation of the knot about the pincers which, by rotating, grasps one of the threads and holds it, whilst the stretcher causes the grasped end to pass over the thread looped around the said pincers, scissors acting to cut the ends of the threads projecting beyond either side of the knot formed.

The accompanying drawings illustrate, by way of example only, a form of construction of a hand apparatus embodying the mechanism above defined in its principle. In the drawings are also illustrated diagrammatic views explaining the operation of the mechanism.

Fig. 1 shows a sheet-bend as formed, but before tightening it.

Figs. 2 to 8 are diagrammatic views explaining the operation of the knot-forming mechanism.

Fig. 9 is an elevation of the hand apparatus.

Fig. 10 is a view corresponding to Fig. 9, one of the thread-carrying cheek members being removed.

Fig. 11 is a view similar to Fig. 10, the parts be ing shown in another operating position.

Fig. 12 is a plan view with horizontal section made according to line l2l2 of Fig. 11.

Fig. 13 is a sectional elevation made according to line I3-l3 of Fig. 12, of the apparatus seen on the side of the lateral face opposed to that shown in Figs. 9 to 11. V

In the form of construction illustrated, the apparatus is provided with two parallel cheek members I and 2 secured on a frame 3; as will be explained later on. These cheek members arecut away in order to receive the ends of the threads to be tied, and pincers 4 can rotate about an axis situated at equal distances from both cheek members.

Before'describing the mechanism in detail, its

operation will be described with reference to Figs;

The two threads 5 and B tobe united are stretched between both cheek members I and 2 and fitted into the grooves 7. 8, 9, 10, of the latter,

'as shown in Fig. 2. The pincers 4 being in the position shown in this figure, it is so placed that its point or nose comes between both threads which are already crossed at H. the control device of the mechanism, as will be explained later on, the pincers 4 rotates about its axis and comes in the position shown in Fig. 3, while two hooks or thread-crossers l2 and I3 move in order to cause a crossing point of the threads to appear at I4. During the entire period of formation of the knot, the thread-'crossers l2 and I 3 are maintained in the position they occupy in Fig. 3, as well as a nose [5 firmly holding the thread 6 at the bottom of the groove 9.

The pincers continues its rotation and its end enters between both threads at the right of the crossing point I4, thus moving this crossing point towards the left so as to obtain the formation shown in Fig. 4, inwhich parts are broken away for greater clearness. The pincers 4, still continuing its rotation, is subjected to the action of a control device, which will be described hereinafter in detail, and opens as shown in Fig. 5, so that one of its noses enters between both threads at the left of the crossing point II. The thread 5 is thus placed between both noses of the pincers.

In Fig. 6, the'pincers 4, through further rotation, progressively closes on the thread 5 and cuts it, holding the end of its portion at the right hand part of the drawing, clamped between its noses as shown in Fig. '7.

At this moment, the mechanism, always sub-- jected to the action of its control device, causes a unit l6 comprising a stretching hook I! and scissors! to move between the cheek members I and 2. The stretching hook I! (Fig. 7) comes under the thread 6 at the right-hand side of the pincers 4, at the same time as the open scissors l8 rise, thus bringing both their blades on either side of the said thread, but at the left-hand side of the pincers. Simultaneously, the pincers 4 By acting on continues its movement of rotation and the unit It continues to rise. The thread 6 is cut (Fig. 8) and the rising movement of the stretcher ll causes the threads looped around the pincers 4 to pass over the end of the latter holding the thread 5. The sheet-bend identical to the representation of the same given in Fig. 1 is formed. Correct tightening, that is to say tightening cf- Iected by exerting a pull on the proper thrums is effected by relative displacement of the stretcher I1 and pincers 4. When the knot is terminated, the control device releases the elements of the mechanism and the thread-crossers l2 and I3 resume the position they occupy in Fig. 2. The tied threads can then be removed.

It is to be noted that for downy threads, such as wool or silk threads, the scissors l8 can be so arranged as to hold the end of the cut thread, in order to tighten the knot by exerting a pull on the four ends held. In the form of construction of the hand apparatus illustrated in Figs. .9 to 13, the various parts of the mechanism are mounted on a frame 3 provided with a handle l9 with an adjustable strap 20, made of leather or the like, allowing to secure it on the four fingers of the hand, the thumb of the latter remaining free.

In the frame 3 is formed a housing adapted to receive a spindle 2|, one of the ends of which is cut so as to constitute a pinion 22, the other end carrying the pincers 4 already mentioned. The said pincers has a fixed jaw and a movable jaw 4 pivoted at 23 and provided with a projection 24 which can come in contact with an operating socket 25. This socket is eccentrically arranged relatively to the spindle 2|, so that the rotation of the latter causes the pincers 4 to open and close as above described. The spindle 2| has a portion 26 of reduced diameter in which extends the end of a screw 2.! (Fig. 13) which holds it stationary in the axial direction, whilst allowing its free angular movement.

A disc 28, providedwith an operating trigger 29, is pivoted on the frame 3 about; an axis constituted by the smooth stem of a screw 30, on the head of which a spiral spring 3| is secured. The other end of the spring presses on a finger 32 of the disc 28, so as to restore the latter to the position shown in Fig. 10, when no external stress is exerted on the same. A toothed segment 33 is provided on the inner face of the disc 28 and permanently meshes with the pinion 22. By acting on the trigger 29 with the thumb of the hand holding the apparatus, a movement of rotation is imparted to the pincers 4, which movement for effecting the cycle of the operations described above, is slightly greater than 360 degrees.

The disc 28 and its trigger constitute the driving element of the entire mechanism. All the parts participate to the angular displacements of the disc. Two cheek members I and 2 are secured, by screws 34 or otherwise, on the frame 3, and are provided with notches 1, 8, 9, ID in which the threads extend, as already explained with reference to Figs. 2 to 8. A lever 36 is pivoted, at 35, on the frame 3, and the free end 01 this lever is so shaped as to' constitute the stretcher or hook I! already mentioned (Figs. 2 to 8). On the said free end are arranged the scissors l8. The blade I8 of the latter is secured at two points 3'l-and 38, and the blade I8 is pivoted about the point 38. The latter blade is provided with an arm l8", to the end of which is pivotally connected an auxiliary lever or link 39 pivoted on the cheek member 2 at a point 40 different from the point 35; A finger 4|, provided on the disc 28, ensures, by entering a notch 42 of the lever 36, the movement of the stretching hook l1, and the opening and closing of the scissors l8. For tying woolen or silk threads, the lever 36 can be replaced by a lever the end of which is such that it acts conjointly with the blades of the scissors l8 for retaining the cut thread, for the purpose indicated above.

The disc 28 also ensures the operation of the thread-crossers l2 and I3 and of the clamping nose or finger IS, in the following manner:

Two levers 44 and 45 are mounted on a spindle 43 freely passing through the frame, and these levers are provided with a trunnion at their free end. On the trunnion of the lever 45 is pivoted the arm l2 oi the thread-crosser l2, and on the trunnion of the lever 44 is pivoted the end of the clamping nose l5 guided by its own groove 46 along a screw 41, and by the groove 48 of the cheek member 42. The second thread-crosser I3 is pivoted at 49 on the cheek member I, and is pivotally connected at 50 to the first threadcrosser I 2. The angular displacements of the levers 44 and 45 are ensured by a finger 5| a'djacent to the notch 52 of the'disc 28 and acting on a finger 53 rigid with the spindle 43 common to both levers 44 and 45.

The mechanism which has just been described is applicable to any machine which, among the various operations it eflects, can necessitate the tying together of two ends of any threads or bonds.

It is to be noted that the thread-crossers l2 and I3 can be dispensed with, if it is desired to simplify the apparatus; the crossing of the threads might, in fact, be effected by hand, when they are inserted in the grooves 1, 8, 9, IU of the cheek members I and 2 or other suitable supports. Such an arrangement, which is not so convenient as that described, is obviously included in the scope of the invention.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a mechanism for forming a Weaver's knot of the type comprising rotary pincers, on both sides of which the two threads to be tied are elongated and held between means for tightening and crossing threads disposed on both sides of the said rotary pincers, also scissors for cutting the threads according to the formation of the knot by rotation of the pincers after crossing threads; a unit comprising a pair of scissors and a stretching hook movable about an axis perpendicular to the axis of rotation oi. the rotary' pincers, means for conjugating the angular displacements of the said rotary pincers and the said unit so that, in the last 90 degrees through which the rotary pincers passes, the hook commences to disengage the knot formed on the pincers and the scissors operate to grasp, cut and retain the same end of thread as that under which the hook has passed so that the correct tightening of the knot is eflected by exerting a tightening pull on the thread ends.

2. In a mechanism for forming a weavers knot of the type comprising rotary pincers on both sides of which the two threads to be tied are elongated and held between means for tightening and crossing threads disposed on both sides of the said rotary pincers, also scissors for cutting the threads according to the formation of the knot by rotation of the pincers after crossing threads; a unit comprising a pair of scissors and a hook movable about an axis perpendicular to the axis of rotation of the rotary pincers, a notched member on the spindle of the rotary pincers, a toothed segment with notched periphery on a disk provided with an operating trigger, a finger on the said disk for actuating the unit, comprising the hook and scissors, so that in the last 90 degrees through which the rotarv pincers passes, the hook commences to disengage the knot formed on the pincers and the scissors operate to grasp, cut and retain the same end of thread as that under which the hook has passed so that the correct tightening of the knot is effected by exerting a tightening pull on the ends.

3. In a mechanism according to claim 2. a unit pivoted at a fixed point of the frame of the mechanism and comprising a stretching hook and a pair of scissors adjacent to the said hook,

frame of the mechanism diflerent from the fixed point of the unit so that the angular displace-- ment of the unit also ensures the movement of the blade or the scissors secured to the body 01 the hook.

EMILE ADRIAN. m 

